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Range-dependent matched-field geoacoustic inversion using a tonal source towed on circular tracks.

Florian Meyer1, William S Hodgkiss2, Augustin A Saucan3

  • 1Scripps Institution of Oceanography and Department of Electrical and Computer Engineering, University of California at San Diego, La Jolla, California 92093, USA.

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Summary

This study estimates acoustic properties of the New England Mud Patch using advanced Bayesian geoacoustic inversion. The developed Metropolis-Hastings method accurately determines mud-related parameters and spatial variability.

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Area of Science:

  • Oceanography
  • Acoustics
  • Geophysics

Background:

  • Acoustic properties of marine sediments are crucial for understanding sound propagation.
  • Spatial variability in seabed characteristics impacts acoustic models.
  • Previous methods lacked the ability to fully capture range-dependent geoacoustic properties.

Purpose of the Study:

  • To estimate acoustic properties and their spatial variability on the New England Mud Patch.
  • To develop and validate an advanced Bayesian geoacoustic inversion method.
  • To assess the range dependence of water depth and sediment thickness.

Main Methods:

  • Utilized tonal signals (303-953 Hz) from a towed source and a vertical line array.
  • Developed a Metropolis-Hastings (MH) method incorporating adaptation, principal-component updates, and parallel tempering.
  • Employed an observation model based on adiabatic normal modes for sound propagation.
  • Parametrized geoacoustic models with linear depth-dependent properties, focusing on sound speed.

Main Results:

  • Accurately estimated mud-related geoacoustic parameters.
  • Successfully determined the range dependence of water depth and upper-sediment mud thickness.
  • Demonstrated the effectiveness of the advanced MH method compared to a range-independent reference.

Conclusions:

  • The developed MH method provides accurate geoacoustic parameter estimation, including spatial variability.
  • The approach effectively models range-dependent acoustic properties in marine environments.
  • This study enhances seabed characterization capabilities for acoustic applications.